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    Subject[PATCH 5.2 25/66] tcp: Reset bytes_acked and bytes_received when disconnecting
    Date
    From: Christoph Paasch <cpaasch@apple.com>

    [ Upstream commit e858faf556d4e14c750ba1e8852783c6f9520a0e ]

    If an app is playing tricks to reuse a socket via tcp_disconnect(),
    bytes_acked/received needs to be reset to 0. Otherwise tcp_info will
    report the sum of the current and the old connection..

    Cc: Eric Dumazet <edumazet@google.com>
    Fixes: 0df48c26d841 ("tcp: add tcpi_bytes_acked to tcp_info")
    Fixes: bdd1f9edacb5 ("tcp: add tcpi_bytes_received to tcp_info")
    Signed-off-by: Christoph Paasch <cpaasch@apple.com>
    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/ipv4/tcp.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/ipv4/tcp.c
    +++ b/net/ipv4/tcp.c
    @@ -2614,6 +2614,8 @@ int tcp_disconnect(struct sock *sk, int
    tcp_saved_syn_free(tp);
    tp->compressed_ack = 0;
    tp->bytes_sent = 0;
    + tp->bytes_acked = 0;
    + tp->bytes_received = 0;
    tp->bytes_retrans = 0;
    tp->duplicate_sack[0].start_seq = 0;
    tp->duplicate_sack[0].end_seq = 0;

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